Removed the vi format comments from the source

Vim users can use the [editorconfig plugin](https://github.com/editorconfig/editorconfig-vim) to automatically set tab spacing for the SDL coding style.

Fixes https://github.com/libsdl-org/SDL/issues/6903

src/render/opengl/SDL_glfuncs.h

@@ -474,5 +474,3 @@ SDL_PROC(void, glVertexPointer,
          (GLint size, GLenum type, GLsizei stride,
           const GLvoid *pointer))
 SDL_PROC(void, glViewport, (GLint x, GLint y, GLsizei width, GLsizei height))
-
-/* vi: set ts=4 sw=4 expandtab: */

src/render/opengl/SDL_render_gl.c

@@ -1964,5 +1964,3 @@ SDL_RenderDriver GL_RenderDriver = {
 };
 
 #endif /* SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED */
-
-/* vi: set ts=4 sw=4 expandtab: */

src/render/opengl/SDL_shaders_gl.c

@@ -577,5 +577,3 @@ void GL_DestroyShaderContext(GL_ShaderContext *ctx)
 }
 
 #endif /* SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED */
-
-/* vi: set ts=4 sw=4 expandtab: */

src/render/opengl/SDL_shaders_gl.h

@@ -56,5 +56,3 @@ extern void GL_SelectShader(GL_ShaderContext *ctx, GL_Shader shader);
 extern void GL_DestroyShaderContext(GL_ShaderContext *ctx);
 
 #endif /* SDL_shaders_gl_h_ */
-
-/* vi: set ts=4 sw=4 expandtab: */